DevToolsForYou
Private by defaultRuns in your browser

Case converter

Paste your text and pick a case format to convert it instantly — no button needed.

Related toolsAll Text & code →

Word Counter

Count words, characters, sentences, paragraphs, and estimated reading time for any block of text.

Byte Size Counter

Calculate the exact byte size of any text in UTF-8 encoding, shown in bytes, KB, and MB.

Regex Tester

Test regular expressions against any string with live match highlighting, capture groups, and flag controls.

Diff Checker

Paste two texts and instantly see line-by-line differences with added, removed, and unchanged lines highlighted.

Lorem Ipsum Generator

Generate lorem ipsum placeholder text by words, sentences, or paragraphs — copy it instantly for mockups, wireframes, and designs.

Duplicate Line Remover

Paste any text and instantly remove duplicate lines — with options for case sensitivity, whitespace trimming, and sorted output.

Text Sorter

Sort lines of text alphabetically, numerically, or in reverse — with options for case sensitivity and duplicate removal.

String Escape Tool

Escape and unescape strings for JSON, SQL, JavaScript, and Regex — instantly in your browser.

SQL EXPLAIN Plan Viewer

Paste a PostgreSQL EXPLAIN output and visualize the query execution plan as a colour-coded, annotated tree with cost estimates and row counts.

SQL EXPLAIN ANALYZE Analyzer

Paste a PostgreSQL EXPLAIN ANALYZE output to profile query performance, flag slow nodes, and identify row estimation mismatches that cause bad plans.

Dockerfile Validator

Paste a Dockerfile and get instant lint feedback: unknown instructions, unpinned tags, apt-get anti-patterns, missing USER, shell-form CMD/ENTRYPOINT, and more.

Email and URL Extractor

Paste any text and instantly extract all email addresses and URLs. Results are deduplicated, sorted, and copyable one at a time or all at once.

Regex Generator

Build regular expressions from common presets or write your own, then test them live against sample strings with inline match highlighting. Flags, capture groups, and copy support included.

Case Converter

About this tool

Naming conventions are not decoration — they are load-bearing. A JSON API that returns snake_case keys feeding a TypeScript codebase that expects camelCase produces undefined at runtime, not a compile error. Kubernetes manifests and CSS classes want kebab-case. Go exports by capitalising the first letter, so the case of an identifier changes its visibility. Python's PEP 8 asks for snake_case functions and PascalCase classes; SQL columns are conventionally snake_case; environment variables are SCREAMING_SNAKE_CASE. Converting between them by hand across a list of fifty field names is tedious and error-prone, and the mistakes are the quiet kind that surface later. This tool converts pasted text between UPPERCASE, lowercase, Title Case, Sentence case, camelCase, PascalCase, snake_case, and kebab-case, updating live as you type. It handles multi-line input, so you can paste a whole column of identifiers and convert them in one pass. Title Case follows simple word-boundary rules rather than a publisher's style guide, so short prepositions are capitalised too. Everything runs in your browser.

No signup requiredRuns in your browserInstant results
How to use
  1. 1

    Paste or type your text into the input field.

  2. 2

    Select the case format: UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case, or kebab-case.

  3. 3

    The converted text appears instantly — click Copy to copy it.

Why use this tool?
  • →

    Convert variable names between camelCase, snake_case, and kebab-case when switching between languages.

  • →

    Fix inconsistent casing in copy, headlines, or content before publishing.

  • →

    Quickly format text to title case for headings or sentence case for body content.

ExamplesInput → output

To title case

Inputthe quick brown fox
OutputThe Quick Brown Fox

To camelCase

Inputmy variable name
OutputmyVariableName

To snake_case

InputMy Variable Name
Outputmy_variable_name
Common errorsAnd how to fix them

Acronyms come out wrong — userID becomes userId or user_i_d

Cause: Case conversion detects word boundaries from capitalisation, and a run of capitals is genuinely ambiguous. There is no way to know whether IDs is one word or two without a dictionary.

Fix: Fix acronyms by hand after converting, or standardise on treating acronyms as ordinary words in your codebase — userId rather than userID — which is what Google's Java and TypeScript style guides recommend precisely because it round-trips cleanly.

Converting to camelCase leaves the original separators in place

Cause: The input used a separator the converter did not treat as a word boundary — a dot, a slash, or a non-breaking space pasted from a document rather than a regular space.

Fix: Replace unusual separators with spaces, hyphens, or underscores first. Non-breaking spaces from copied web or Word content are a frequent and invisible cause.

Sentence case lowercases proper nouns

Cause: Sentence case capitalises the first letter after sentence-ending punctuation and lowercases the rest. It has no way to recognise names, brands, or acronyms.

Fix: Use Sentence case on ordinary prose and restore proper nouns afterwards, or use Title Case where every word should keep a capital.

Frequently asked questionsCommon questions answered

These answers explain common case converter tasks, expected input formats, and edge cases so both visitors and search engines can understand what this tool does.

What is title case?

Title case capitalises the first letter of each word. It is commonly used for headings, article titles, and proper nouns.

What is sentence case?

Sentence case capitalises only the first letter of the first word and leaves the rest lowercase, matching standard sentence formatting.

What is camelCase?

camelCase removes spaces and capitalises the first letter of each word except the first. It is widely used for variable and function names in JavaScript and other languages.

What is snake_case?

snake_case replaces spaces with underscores and lowercases everything. It is common in Python, database column names, and file names.

What is kebab-case?

kebab-case replaces spaces with hyphens and lowercases everything. It is standard for CSS class names, HTML attributes, and URL slugs.